Quanterix director exercises 8,073 RSUs into shares

Quanterix Corp director Myla Lai-Goldman exercised restricted stock units into common shares.

Rhea-AI Filing Summary

Quanterix Corp director Myla Lai-Goldman exercised restricted stock units into common shares. She converted 8,073 restricted stock units into 8,073 shares of Common Stock at a reported price of $0.00 per share, increasing her direct common stock holdings to 15,041 shares.

Following this transaction, she also holds 16,391 restricted stock units, which convert into common stock on a one-for-one basis. These units come from a prior grant of 24,464 restricted stock units awarded on July 8, 2025, vesting 33%, 33%, and 34% over three years.

Insider Trade Summary

8,073 shares exercised/converted

Exercise 2 txns

Insider LAI GOLDMAN MYLA

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit	8,073	$0.00	$0.00
Exercise	Common Stock	8,073	$0.00	$0.00

Holdings After Transaction: Restricted Stock Unit — 16,391 contracts (Direct); Common Stock — 15,041 shares (Direct)

Footnotes (2)

1. F1. Restricted stock units convert into common stock on a one-for-one basis.
2. F2. On July 8, 2025, the reporting person was granted 24,464 restricted stock units, vesting 33%, 33%, and 34% on the first, second, and third anniversaries of the grant date, respectively.

Key Figures

RSUs exercised: 8,073 units Shares held after transaction: 15,041 shares RSUs remaining: 16,391 units +2 more

5 metrics

RSUs exercised 8,073 units Converted into 8,073 Common Stock shares on July 8, 2026

Shares held after transaction 15,041 shares Direct Common Stock holdings following RSU conversion

RSUs remaining 16,391 units Restricted stock units outstanding after the exercise

Original RSU grant 24,464 units Granted on July 8, 2025; vesting 33%, 33%, 34% over three years

Exercise price $0.00 per share Price reported for conversion of RSUs into Common Stock

Key Terms

Restricted stock units, derivative security, Common Stock

3 terms

Restricted stock units financial

"On July 8, 2025, the reporting person was granted 24,464 restricted stock units, vesting 33%, 33%, and 34%..."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

derivative security financial

"transaction_code_description: Exercise or conversion of derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

Common Stock financial

"Restricted stock units convert into common stock on a one-for-one basis."

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Quanterix (QTRX) director Myla Lai-Goldman report?

Quanterix director Myla Lai-Goldman reported exercising 8,073 restricted stock units into 8,073 shares of Common Stock at a stated price of $0.00 per share. This is a compensation-related conversion, not an open-market stock purchase or sale.

How many Quanterix (QTRX) shares does Myla Lai-Goldman hold after this Form 4?

After the reported transaction, Myla Lai-Goldman directly holds 15,041 shares of Quanterix Common Stock. This reflects the addition of 8,073 shares received from converting restricted stock units, as disclosed in the Form 4 insider filing.

How many restricted stock units does the Quanterix (QTRX) director still own?

Following the exercise, Myla Lai-Goldman holds 16,391 restricted stock units. Each restricted stock unit converts into one share of Quanterix Common Stock, providing additional potential equity exposure as those units vest over time according to their grant terms.

What are the vesting terms of Myla Lai-Goldman’s Quanterix (QTRX) RSU grant?

On July 8, 2025, Myla Lai-Goldman was granted 24,464 restricted stock units. These RSUs vest 33%, 33%, and 34% on the first, second, and third anniversaries of the grant date, respectively, providing staggered equity-based compensation over three years.

Does this Quanterix (QTRX) Form 4 show any stock sales by the director?

The Form 4 does not report any open-market stock sales. It shows an exercise or conversion of 8,073 restricted stock units into 8,073 common shares, classified as a derivative exercise transaction rather than a buy or sell in the market.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 07/09/2026 - 05:19 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

LAI GOLDMAN MYLA

(Last) (First) (Middle)

C/O QUANTERIX CORPORATION

900 MIDDLESEX TURNPIKE

(Street)

BILLERICA MASSACHUSETTS 01821

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Quanterix Corp [ QTRX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/08/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/08/2026		M		8,073	A	(1)	15,041	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Unit	$0.00	07/08/2026		M			8,073	(2)	(2)	Common Stock	8,073	$0.00	16,391	D

Explanation of Responses:

1. Restricted stock units convert into common stock on a one-for-one basis.

2. On July 8, 2025, the reporting person was granted 24,464 restricted stock units, vesting 33%, 33%, and 34% on the first, second, and third anniversaries of the grant date, respectively.

Remarks:

	/s/ Meghan Shevlin, Attorney-in-Fact	07/09/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)